Centrifugal Fan

Centrifugal Fan – 4-72 Series:

The Air-Moving Heart of Grain, Feed and Dust Collection Systems

By Wuxi Hasen Import and Export Co., Ltd | www.immyhitech.com

Every pneumatic conveying line, aspiration network and dust collector in a flour mill or feed plant depends on one component that is easy to overlook: the fan. If the fan is undersized, aspiration points lose suction, dust escapes into the workshop and filter bags blind. If it is oversized, the plant wastes electricity every hour it runs. Choosing a fan with the right air volume, pressure and efficiency is one of the simplest ways to improve plant hygiene, product recovery and operating cost at the same time.

Wuxi Hasen Import and Export Co., Ltd, a Wuxi-based supplier of grain, oil and feed machinery with over 30 years of industry experience, manufactures the GM Centrifugal Fan based on the proven 4-72 aerodynamic design. It is built for continuous duty in aspiration, pneumatic conveying and dust removal systems, and is matched to Hasen's TBLM and BLMF-H pulse-jet dust collectors and cyclone separators.

GM Centrifugal Fan (4-72 series) by Wuxi Hasen

What Is a 4-72 Centrifugal Fan?

The 4-72 is a single-inlet, medium- and low-pressure centrifugal fan. Air enters axially through the inlet cone, is accelerated by a backward-inclined impeller and leaves through a volute (scroll) housing at right angles to the inlet. The designation comes from its aerodynamic parameters: a pressure coefficient of about 0.4 and a specific speed of about 72. The result is a fan that combines a wide stable operating range with high efficiency – peak total efficiency in Hasen's published performance tables reaches 86.1%.

Because the performance curve is flat around its best-efficiency point, a 4-72 fan tolerates the changes in system resistance that happen in real plants – for example, as filter bags load with dust between pulse-cleaning cycles, or as dampers are adjusted on different aspiration branches.

Construction and Key Components

The GM fan is built from five main assemblies, which makes it simple to inspect, maintain and – when required – rotate to a different outlet position on site:

•Motor (1) — Direct-coupled electric motor; the standard range runs at 2900 r/min for the smaller sizes, with 4-pole options (for example 5.5 kW, 7.5 kW and 11 kW) for larger machine numbers.

•Support frame (2) — Rigid steel base frame carrying the motor and bearing assembly, mounted on vibration-damping feet.

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